package main

import "fmt"
const boilingF = 212.0
func main(){
  var f = boilingF
  var c = (f - 32) *5/9
  fmt.Printf("boiling point = %g °F or %g °C \n",f,c)
  //输出：
  //boiling point = 212 °F or 100 °C
 }
